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8_6 - 8.5 A soft drink with the properties of 10 °C water...

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Unformatted text preview: 8.5 A soft drink with the properties of 10 °C water is sucked through a 4—mm—diameter, 0.25- m-long straw at a rate of 4 cm3/s. Is the flow at the outlet of the straw laminar? Is it fully devel- 0ped? Explain. Re= VD 0.3/ag-(4xlv'3m) 77 s W = 97/ 42/005 n.‘ [3 lamina/5 How. =0.05 Re , or 13 40.00077! )(4‘X/0'3m) = 0.233 m < 0.2507 D or we have M dew/cw f/aw cf #79 exh’. - 8.6 To cool a given room it is necessary to supply 4 ft3/s of air through an 8-in.-diarneter pipe. Approximately how long is the entrance length in this pipe? ‘fflf ‘ , a ,y-fif Vz‘g‘ = m WAS? Mug wn‘li V~A57xm 5 (see Table/.6) Re =.—V—D = W. = 48,800 >1/ooo so f/m f/ow is {whale/77’. 5 Hence, [/5 é: . 4%in or re . 654(43800) 785;) =47: 7 If ...
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